Initial support for PowerPC specific code in Mesa and DRI drivers. DRI

drivers built on PowerPC systems should now show things like "PowerPC" or
"PowerPC/Altivec" in the GL_RENDERER string.

The VMX moniker is used for Altivec/Velocity Engine/VMX SIMD additions.  I
chose this not because I work for IBM but because it's a LOT shorter to
type. :)

2 files changed, 139 insertions, 0 deletions

diff --git a/src/mesa/ppc/common_ppc.c b/src/mesa/ppc/common_ppc.c
new file mode 100644
index 0000000..13526df
--- /dev/null
+++ b/src/mesa/ppc/common_ppc.c
@@ -0,0 +1,88 @@
+/*
+ * (C) Copyright IBM Corporation 2004
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
+ * IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file common_ppc.c
+ * Check CPU capabilities & initialize optimized funtions for this particular
+ * processor.
+ *
+ * \author Ian Romanick <idr@us.ibm.com>
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#ifdef USE_PPC_ASM
+#include <elf.h>
+#endif
+
+unsigned long _mesa_ppc_cpu_features = 0;
+
+/**
+ * Detect CPU features and install optimized transform and lighting routines.
+ * Currently, CPU features are only detected.  The optimized routines have
+ * yet to be written.
+ * 
+ * \bug
+ * This routine is highly specific to Linux kernel 2.6.  I'm still waiting
+ * to hear back from the glibc folk on how to do this "right".
+ */
+
+void _mesa_init_all_ppc_transform_asm( void )
+{
+#ifdef USE_PPC_ASM
+   const pid_t  my_pid = getpid();
+   char file_name[32];
+   FILE * f;
+#ifdef __powerpc64__
+   Elf64_auxv_t  v;
+#else
+   Elf32_auxv_t  v;
+#endif
+
+   sprintf( file_name, "/proc/%u/auxv", (unsigned) my_pid );
+   f = fopen( file_name, "rb" );
+   if ( f != NULL ) {
+      while( 1 ) {
+	 ssize_t elem = fread( & v, sizeof( v ), 1, f );
+
+	 if ( elem < 1 ) {
+	    break;
+	 }
+
+	 if ( v.a_type == AT_HWCAP ) {
+	    _mesa_ppc_cpu_features = v.a_un.a_val;
+	    break;
+	 }
+      }
+
+      fclose( f );
+   }
+   
+# ifndef USE_VMX_ASM
+   _mesa_ppc_cpu_features &= ~PPC_FEATURES_HAS_ALTIVEC;
+# endif
+#endif
+}
diff --git a/src/mesa/ppc/common_ppc_features.h b/src/mesa/ppc/common_ppc_features.h
new file mode 100644
index 0000000..4d46ca0
--- /dev/null
+++ b/src/mesa/ppc/common_ppc_features.h
@@ -0,0 +1,51 @@
+/*
+ * (C) Copyright IBM Corporation 2004
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
+ * IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file common_ppc_features.h
+ * Interface for determining which CPU features were detected.
+ *
+ * \author Ian Romanick <idr@us.ibm.com>
+ */
+
+#ifndef COMMON_PPC_FEATURES_H
+#define COMMON_PPC_FEATURES_H
+
+#ifdef USE_PPC_ASM
+#include <asm/cputable.h>
+
+extern unsigned long _mesa_ppc_cpu_features;
+
+
+/* The PPC_FEATURE_* values come from asm/cputable.h.  Should we define
+ * versions of them here if that file does not exist?  This will only
+ * matter once these code paths are supported on non-Linux platforms.
+ */
+
+#define cpu_has_64  ((_mesa_ppc_cpu_features & PPC_FEATURE_64) != 0)
+#define cpu_has_vmx ((_mesa_ppc_cpu_features & PPC_FEATURE_HAS_ALTIVEC) != 0)
+#define cpu_has_fpu ((_mesa_ppc_cpu_features & PPC_FEATURE_HAS_FPU) != 0)
+
+#endif /* USE_PPC_ASM */
+#endif /* COMMON_PPC_FEATURES_H */